Basic Nickel-Iron Battery Experiment

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Discussion Overview

The discussion centers around the construction and efficiency of a basic nickel-iron battery, specifically exploring the implications of using nickel-iron alloy plates versus separate nickel and iron plates. The conversation touches on the chemistry involved in generating electromotive force (emf) and the design considerations of the battery plates.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires whether both plates of the battery can be made from a nickel-iron alloy and questions how this would affect efficiency compared to using separate nickel and iron plates.
  • Another participant challenges the feasibility of generating emf with identical electrodes, suggesting that the intended operation may involve charging the cell first, similar to a lead-acid battery, but raises concerns about the chemical compatibility.
  • A third participant references an article indicating that traditional nickel-iron batteries use plated electrodes rather than solid ones, providing context on the design and longevity of these batteries.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of using alloy plates and the implications for emf generation, indicating that there is no consensus on the proposed design or its efficiency.

Contextual Notes

The discussion includes assumptions about the chemistry of the battery and the design of the electrodes, which remain unresolved. There is also a lack of clarity regarding the specific operational conditions that would allow for effective emf generation with the proposed setup.

Yrton
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Hi everyone.
I'm interested in building a basic nickel-iron battery. I was wondering if both plates can be made off of nickel-iron alloy (35% iron and 65% nickel).
How will the efficiency of this model differ compared to if I use iron and nickel plates separately?
 
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How are you going to generate an emf if the electrodes are the same?
 
mjc123 said:
How are you going to generate an emf if the electrodes are the same?
I guess he plans to charge the cell first - as in a Lead Acid battery. But whether the Chemistry would allow it is another question.
 
This reference says that the electrodes are plated, not solid.

https://en.wikipedia.org/wiki/Nickel%E2%80%93iron_battery said:
The nickel–iron battery (NiFe battery) is a rechargeable battery having nickel(III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets.

It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, and short-circuiting) and can have very long life even if so treated. It is often used in backup situations where it can be continuously charged and can last for more than 20 years.

Due to its low specific energy, poor charge retention, and high cost of manufacture, other types of rechargeable batteries have displaced the nickel–iron battery in most applications.

This part of the article gives extensive information on design of the plates.
https://en.wikipedia.org/wiki/Nickel–iron_battery#Plates
 

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